CN111181737B

CN111181737B - Control method, power receiving device and system

Info

Publication number: CN111181737B
Application number: CN201811341257.8A
Authority: CN
Inventors: 王海飞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-11-12
Filing date: 2018-11-12
Publication date: 2021-09-14
Anticipated expiration: 2038-11-12
Also published as: EP3783834A4; EP3783834B1; US20210119813A1; US11528154B2; EP3783834A1; CN111181737A; FI3783834T3; WO2020098613A1

Abstract

The application provides a control method, a powered device and a system, which realize the detection of the power grade of the powered device in a hardware mode, and do not need to acquire the power grade of the powered device in a message interaction mode, thereby avoiding the time consumed by modulation and demodulation in the message transmission process, and greatly reducing the time for detecting the power grade of the powered device by a power supply device.

Description

Control method, power receiving device and system

Technical Field

The embodiment of the invention relates to the field of power over ethernet, in particular to a control method, a powered device and a system.

Background

In a power over ethernet system, a Power Sourcing Equipment (PSE) provides a data signal and a power signal to a Powered Device (PD) through a pair of twisted pairs, see a power class detection process shown in fig. 1B, where the PSE detects a power class of the powered device by using a serial data communication classification protocol (SCCP), and then the PSE provides a corresponding operating voltage to the powered device according to the detected power class.

However, the applicant has found that the process of detecting the power level of the user equipment through SCCP is: the power level is obtained by exchanging messages between the data transceivers of the power supply equipment and the powered equipment, modulation and demodulation are needed in the message transmission process, the interaction process can be completed by a plurality of clock cycles, and the time for the powered equipment to detect the power level of the power supply equipment is hundreds of milliseconds, so that the requirement of quick start cannot be met.

Disclosure of Invention

The technical problem to be solved by the present application is to provide a control method, a powered device and a system, which implement detecting a power level of the powered device in a hardware manner, and greatly reduce time consumed for detecting the power level.

In a first aspect, the present application provides a control method, including: the powered device enters a first state, the powered device controls at least one of one or more first loads of the powered device to be in a conducting state, and a second load of the powered device is in a disconnected state. The powered device may be a powered device, the powered device includes one or more first loads and second loads, the first loads and the second loads are devices consuming power in the circuit, the first loads and the second loads may be inductive loads, capacitive loads, or resistive loads, and combinations of the three types of loads, which is not limited in this application. The connection relationship of the one or more first loads may be series, parallel or series-parallel, and the application is not limited thereto. The first load is used for detecting the power level of the powered device, and the second load is a work load of the powered device. The on state represents a state in which the load is connected to the circuit to consume power of the power supply apparatus, and the off state represents a state in which the load is not connected to the circuit to consume power of the power supply apparatus, which may be the power supply apparatus. The power supply equipment loads the output voltage to the at least one first load to form current, and the power supply equipment detects the current to determine the power grade of the powered equipment, so that the power grade of the powered equipment is detected in a hardware mode, the power grade of the powered equipment is not required to be known in a message interaction mode, time consumed by modulation and demodulation in a message transmission process is avoided, and time for determining the power grade of the powered equipment is greatly reduced.

In a possible design, the at least one first load is in the on state for a part of the time, the second load of the powered device is in the off state, and the length of the part of the time may be preconfigured as required, which is not limited in this application. For example: the total duration of the first load being in the on state is 5ms, then the first load is in the on state for 4.5ms and the second load is in the off state. For the remaining 0.5ms the first load is in a conducting state and the second load is also in a conducting state.

In one possible design, the one or more first loads are all step loads. Wherein the grading load comprises one or more of a resistor, a capacitor, an inductor, a field effect transistor and a transistor.

In one possible design, the first state is a power level detection state for detecting a power level of the powered device. The first state corresponds to a time interval, and a reference time of the time interval may be a time when the power receiving apparatus is electrically connected to the power supply apparatus, and the time may be a zero time. The power class is also called any one of a power class (power class), a class signature (class signature), a power value, a power range, a power consumption value, a power consumption range, an energy consumption value, an energy consumption range, a power table, and an energy consumption table.

In one possible design, the number of the at least one first load is less than the number of the one or more first loads at any time during the powered device being in the first state.

In one possible design, before the powered device enters the first state, the method further includes: and when the powered device detects that a first condition is met, determining that the current state is the first state according to a detection result. The first condition is that a condition for entering the first state is satisfied.

In one possible design, the first condition includes at least one of:

the voltage output by the power supply equipment to the powered equipment is greater than or equal to a first voltage threshold;

the duration of the voltage output to the powered device by the power supply device is greater than or equal to the second voltage threshold is greater than or equal to a first duration;

the voltage output by the power supply apparatus to the power receiving apparatus is in a first voltage range;

the duration of the voltage output to the powered device by the power supply device in the second range is greater than or equal to a second time length;

the current output by the power supply equipment to the powered equipment is greater than or equal to a first current threshold;

the duration that the current output by the power supply equipment to the powered equipment is greater than or equal to the second current threshold is greater than or equal to a third time length;

the current output by the power supply apparatus to the power receiving apparatus is in a first current range;

the duration of the current output by the power supply equipment to the powered equipment in the second current range is greater than or equal to a fourth time length;

the duration that the powered device is in the first state is greater than or equal to a fifth duration;

and receiving an indication signal sent by the power supply equipment, wherein the indication signal is used for indicating the powered equipment to enter a first state.

In one possible design, the method further includes:

the powered device enters a second state; wherein during the second state, the second load is in a conducting state.

In one possible design, the method further includes:

the powered device controls one or more first loads in the powered device to be in a disconnected state.

In one possible design, before the powered device enters the second state, the method further includes:

and the powered device detects that a second condition is met, and determines that the current state is a second state according to the detection result.

In one possible design, the second condition includes at least one of:

the voltage output by the power supply equipment to the powered equipment is greater than or equal to a third voltage threshold;

the duration that the voltage output by the power supply equipment to the powered equipment is greater than or equal to the fourth voltage threshold is greater than or equal to a sixth time length;

the voltage output by the power supply apparatus to the power receiving apparatus is within a third voltage range;

the duration of the voltage output by the power supply equipment to the powered equipment in the fourth voltage range is greater than or equal to a seventh time length;

the current output by the power supply equipment to the powered equipment is greater than or equal to a third current threshold;

the duration that the current output by the power supply equipment to the powered equipment is greater than or equal to the fourth current threshold is greater than or equal to an eighth time length;

the current output by the power supply apparatus to the power receiving apparatus is in a third current range;

the duration of the current output by the power supply equipment to the powered equipment in the fourth current range is greater than or equal to a ninth time length;

the duration time that the powered device is in the first state is greater than or equal to a tenth duration;

and receiving an indication signal sent by the power supply equipment, wherein the indication signal is used for indicating the powered equipment to enter the second state.

In a second aspect, the present application provides a system comprising a controller, one or more first loads, and a second load, the controller configured to control the apparatus to enter a first state, the controller further configured to control at least one of the one or more first loads in the powered device to be in a conducting state, and the second load in the powered device to be in a disconnected state.

In one possible design, the second load in the powered device is in the off state for all or part of the time that the at least one first load is in the on state.

In one possible design, the one or more first loads are step loads.

In one possible design, the first state is a power level detection state.

In one possible design, the number of first loads in the conducting state is less than or equal to the number of first loads at any time when the powered device is in the first state device.

In one possible design, the controller is further configured to detect that the first condition is satisfied, and determine that the current state is the first state according to a detection result.

In one possible design, the first condition includes at least one of:

the voltage output by the power supply apparatus to the power receiving apparatus is within a first voltage range;

the duration of the voltage output to the powered device by the power supply device in the second voltage range is greater than or equal to a second time length;

the time slot time of the current output to the powered device by the power supply device in the second current range is greater than or equal to a fourth time length;

In one possible design, the controller is further configured to control the powered device to enter a second state; wherein in the second state the device the second load is in a conducting state.

In one possible design, the controller is further configured to control one or more first loads in the powered device to be in an off state.

In a possible design, the controller is further configured to detect that a second condition is satisfied, and determine that the current state is the second state according to the detection result.

In one possible design, the second condition includes at least one of:

the voltage output by the power supply equipment to the powered equipment is greater than or equal to a fourth voltage threshold;

the voltage output by the power supply apparatus to the power receiving apparatus is in a third voltage range;

a duration of a fourth voltage range output by the power supply apparatus to the power receiving apparatus is greater than or equal to a seventh duration;

the duration that the current output by the power supply equipment to the powered equipment is greater than or equal to the fourth current threshold is greater than or equal to the eighth time length;

the duration that the powered device is in the first state is greater than or equal to a tenth duration;

In a third aspect, the present application further provides a power over ethernet system, where the power over ethernet system includes a powered device and a power sourcing equipment in any one of the possible embodiments of the second aspect, where the powered device is a powered device, and the power sourcing equipment is a power sourcing equipment; the power supply device outputs a voltage or a current to the powered device through the network cable, the powered device detects the voltage or the current output by the power supply device through the network cable, and when the powered device enters a first state, the powered device controls at least one first load of one or more first loads in the powered device to be in a conducting state and a second load in the powered device to be in a disconnecting state.

Drawings

Fig. 1A is a schematic structural diagram of a power over ethernet system with a pair of wires according to an embodiment of the present invention;

fig. 1B is a schematic flow chart of a power level detection method according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a power sourcing equipment and a powered device in a power over ethernet system with a pair of wires according to an embodiment of the present invention;

fig. 3A is another schematic structural diagram of a power over ethernet system with a pair of wires according to an embodiment of the present invention;

fig. 3B is a schematic flow chart of a control method according to an embodiment of the present invention;

fig. 3C is a schematic structural diagram of a power receiving device according to an embodiment of the present invention

Fig. 4 is another schematic structural diagram of a power receiving apparatus according to an embodiment of the present invention;

fig. 5 is another schematic structural diagram of a power receiving device according to an embodiment of the present invention.

Detailed Description

In order to reduce the time consumed by a power supply device detecting the power level of a powered device in a power over ethernet over one-wire system, the application provides a power level control method and a related device. The method and the equipment are based on the same inventive concept, and because the principles of solving the problems of the method and the equipment are similar, the implementation of the method and the equipment can be mutually referred, and repeated parts are not repeated.

The present application provides a power class control method and a communication device, which are applied to a power over ethernet system, where the power over ethernet system includes a powered device and a power supply device, for example: as shown in fig. 1A, the power over ethernet system 100 includes a power sourcing equipment 110 and a powered device 120, wherein the power sourcing equipment 110 and the powered device 120 are connected via an ethernet cable (e.g., twisted pair). Wherein, the power supply device 110 superimposes power onto an ethernet cable to be used by the powered device 120, and is also responsible for monitoring and managing the operating status of the connected powered devices 120, and one or more of the powered devices 120 can be connected to one of the power supply devices 110; the powered device 120 is a device that receives power over ethernet, obtains power and data transmitted by the power sourcing equipment 110 through an ethernet cable, and sends data to the power sourcing equipment 110 through the ethernet cable.

Specifically, the power supply device 110 may be a switch, a hub, a router, or the like, and the powered device 120 may be a wireless Access Point (AP), a camera, an IP phone, a smart speaker, a smart lamp, a manipulator, a smart charger, or the like.

Referring to fig. 1B, the power over ethernet process includes 5 operating states: detection (detection), classification (classification), power-up (power-up), operation (operation), and disconnection (disconnection), wherein classification is an optional process, as shown in fig. 1B. The detection is a process of identifying the power supply apparatus 110 to the connected power receiving apparatus 120, and detects the validity of the power receiving apparatus 120 to determine whether to supply power to the power receiving apparatus 120. When the power supply device 110 determines that the powered device 120 is valid, the power level of the powered device 120 may be continuously detected, the powered device 120 supplies power according to the power level of the powered device 120, the powered device 120 enters a power-on process and may normally operate, or, when the power supply device 110 determines that the powered device 110 is valid, the powered device 120 may also directly supply power according to default power, and the powered device 120 enters a power-on stage and may normally operate. When the powered device 120 is disconnected from the network, the power supply device 110 may quickly stop supplying power to the powered device 120, and repeat the detection process. In the embodiments of the present application, the classification state of the above 5 operation states is also referred to as a power level detection state, but the present invention is not limited thereto.

In the embodiment of the application, the power level detection process of the pair of line Ethernet power supply systems is mainly improved. However, it should be understood that the powered device 120 provided in the embodiment of the present application may be a complete powered device, and also has a structure that is already known, and only the components related to power level detection in the powered device 120 are described herein, and details of other components are not repeated. Alternatively, the powered device 120 provided in the embodiment of the present application may be a part of components in the powered device, in particular, components related to power level detection. Alternatively, the powered device 120 provided by the embodiments of the present application may be a component associated with the powered device, in particular a component related to power level detection. The invention is not limited.

In addition, it is to be understood that, in the description of the present application, a plurality means two or more; the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor order.

Referring to fig. 2, a schematic structural diagram of an existing pair of line ethernet power supply systems is shown, where a power supply device supplies power to a powered device through a pair of lines, for example: the powered device and the power supply device are connected by a Twisted Pair (TP), the type of the TP is not limited in the embodiment of the present invention, and the powered device supplies power to the powered device by two wires in the twisted pair, where the TP may be any one of a first type wire, a second type wire, a third type wire, a fourth type wire, a fifth type wire, a sixth type wire, a super-sixth type wire, and a seventh type wire.

The power supply device comprises a first data transceiver U1, a first capacitor C1, a second capacitor C2, a direct current voltage source and a first Ethernet interface E1, wherein the first Ethernet interface E1 comprises a first positive-polarity pin D1+ and a first negative-polarity pin D1-, the first data transceiver U1 is mainly used for transmitting a modulated data signal to the powered device and demodulating the data signal from the powered device, the direct current voltage source Vpse is used for providing a direct current voltage, and the first data transceiver U1 can be a physical layer chip. The positive pole of the direct-current voltage source Vpse is connected with a first positive-polarity pin D1+ of the first ethernet interface E1 and is connected with the first data transceiver U1 through a first capacitor C1; the negative pole of the dc voltage source Vpse is connected to the first negative polarity pin D1 "of the first ethernet interface E1, and is connected to the first data transceiver U1 through the second capacitor C2. Furthermore, the power supply device further comprises a first magnetic bead T1, two wires led out through the positive electrode and the negative electrode of the dc voltage source Vpse pass through the first magnetic bead T1, and the first magnetic bead T1 is used for suppressing the ac voltage generated by the dc voltage source and reducing the interference of the ac voltage.

It can be seen from the structure of the power supply device that the data signal is an alternating current signal, the power supply signal is a direct current signal, and the power supply device isolates the data signal from the power supply signal through the dc blocking effect of the first capacitor C1 and the second capacitor C2, thereby realizing the effect of simultaneously transmitting the data signal and the power supply signal on a pair of lines.

The powered device includes a data transceiver U2, a third capacitor C3, a fourth capacitor C4, a second load Rload, and a second ethernet interface E2, the second data transceiver U2 is mainly used by a user to transmit a modulated data signal to the power supply device and receive a data signal from the power supply device, and the second data transceiver U2 may be a physical layer chip. The second load is a working load of the powered device, the second load may be one or more of a capacitive load, an inductive load and a resistive load, and the second load Rload is used for consuming power of the power supply device. The second ethernet interface E2 includes a second positive polarity pin D2+ and a second negative polarity pin D2-. The first ethernet interface E1 and the second ethernet interface E2 cooperate with each other, for example: the first Ethernet interface E1 is an RJ45 plug, and the second Ethernet interface E2 is an RJ45 socket; or the first Ethernet interface E1 bit RJ45 socket and the second Ethernet interface E2 bit RJ45 socket. When the first ethernet interface E1 and the second ethernet interface E2 are connected by a twisted pair, the first positive-polarity pin D1+ of the first ethernet interface E1 is connected to the second positive-polarity pin D2+ of the second ethernet interface E2, and the first negative-polarity pin D1-of the first ethernet interface E1 is connected to the second negative-polarity pin D2-of the second ethernet interface E2, so that the power supply device supplies power to the powered device through a pair of wires.

The connection relationship between the respective components inside the power receiving apparatus includes: one end of the second load Rload is connected to the second positive polarity pin D2+ of the second ethernet interface E2 and is connected to the second data transceiver U2 through the third capacitor C3; the other end of the second load Rload is connected to the second negative polarity pin D2 "of the second ethernet interface E2, and is connected to the second data transceiver U2 through the fourth capacitor. Further, the powered device further includes a second magnetic bead T2, two wires led out from two ends of the second load Rload pass through the second magnetic bead T2, and the second magnetic bead T1 is configured to suppress the ac voltage loaded to the second load Rload, so as to reduce interference of the ac voltage on the second load rlood.

As can be seen from the above-mentioned structure of the power receiving device, since the data signal is an ac signal and the power signal is a dc signal, the power receiving device isolates the data signal from the power signal by the dc blocking function of the third capacitor C3 and the fourth capacitor C4, thereby achieving the function of simultaneously transmitting the data signal and the power signal on a pair of lines.

Among them, the powered device is a device supporting power over ethernet, for example: the powered device may be a network phone, a wireless base station, a hub, a network camera, a computer, etc.

Different powered devices may need to use different powers when operating, and therefore the power class of the powered device may be detected before the power sourcing equipment provides the operating voltage to the powered device in order to determine the power needed by the powered device. Based on the structure of the power over ethernet system with one pair of wires in fig. 2, the method for detecting the power class of the power receiving device by using the SCCP in the power supply device includes: upon detecting the first ethernet interface E1 that the powered device is docked with the second ethernet interface E2, the power sourcing equipment loads a probing voltage on the first positive polarity pin D1+ and the first negative polarity pin D1-of the first ethernet interface E1, where the probing voltage is smaller than the voltage during normal power supply, for example: the detection voltage is 4V, and whether the detection current between the first positive-polarity pin D1+ and the first negative-polarity pin D1-of the power supply device is within a preset range, if so, it is determined that the accessed powered device is a device supporting power over ethernet. Then, the first data transceiver U1 of the power sourcing equipment sends a request message for inquiring the power level to the second data transceiver U2 through a pair of lines (the first positive pin D1+ and the first negative pin D1-), the second data transceiver U2 obtains the power level information pre-stored in the memory after receiving the request message, and sends a response message carrying the power level information to the first data transceiver U1, so that the power sourcing equipment knows the power level of the powered device according to the response message.

As can be seen from the above method for detecting the power class of a powered device, the power supply device obtains the power class of the powered device by sending a request message and receiving a response message, the modulation and demodulation time of the request message and the response message, and the transmission time of the message in a twisted pair, where the transmission time of the message needs multiple clock cycles, so that the time for detecting the power class by the power supply device is greatly increased, and the time for detecting the power class is generally on the order of hundreds of milliseconds, which cannot meet the requirement of fast power supply.

In order to solve the problem that it takes too long to detect the power class of the powered device at present, an embodiment of the present invention provides the power over ethernet power supply system with one pair of lines shown in fig. 3A to 5.

Referring to fig. 3A, a schematic structural diagram of a power over ethernet system with a pair of wires according to an embodiment of the present invention is provided. The power supply device in the embodiment of the present invention is different from the power supply device in fig. 2 in that the power supply device further includes a controller, for example, as shown in fig. 3A, the first controller includes a control unit K1, a first port of the control unit K1 is connected to the dc voltage source Vpse, a second port of the first controller K1 is connected to the first positive-polarity pin D1+ of the first ethernet interface E1, and a third port of the first controller is connected to the first negative-polarity pin D1-of the first ethernet interface E1.

The powered device in this embodiment is different from the powered device in fig. 2 in that the powered device further includes a second controller, and one or more first loads. For example: as shown in fig. 2, the second controller includes a control unit K2, a first controlled switch S1, and a second controlled switch S2, the number of the first loads is 1, and the first load is a load Rs1 in fig. 2.

The first load Rs1 is connected in series with the first controlled switch S1 and then bridged between the second positive terminal D2+ and the second negative terminal D2-of the second ethernet interface E2, and the second load Rload is connected in series with the second controlled switch S2 and then bridged between the second positive terminal D2+ and the second negative terminal D2-of the second ethernet interface E2. The second positive polarity pin D2+ is connected to the second port of the second data transceiver U2 through a third capacitor C3, and the second negative polarity pin D2-is connected to the second port of the second data transceiver U2 through a fourth capacitor C4.

The first load and the second load in the embodiment of the present invention may be an inductive load, a capacitive load, or a resistive load, or a combination of the three types of loads, which is not limited in this application. For example: the first load comprises one or more of a resistor, a capacitor, an inductor, a field effect transistor, and a transistor.

The controlled switch according to the embodiment of the present invention is used to control the branch in which the controlled switch is located to be in a conducting state or a disconnecting state, and the controlled switches (the first controlled switch and the second controlled switch) include, but are not limited to, a relay, a triode, a field effect transistor, or another type of switch.

The first controller and the second controller may be components or chips such as PD chips that control the on-state and off-state of the first load and the second load, or may be circuit devices composed of a plurality of components. In one possible embodiment, the second controller includes a control unit and a controlled switch, and the control unit is a chip for controlling an open state or a closed state of the controlled switch. The structure of the second controller of the powered device is not limited to the above chip or chip + controlled switch, and may be other structures, and the embodiment of the present invention is not limited.

Referring to fig. 3B, a schematic flow chart of a power level control method according to an embodiment of the present invention is shown, where the control method is based on the system architecture of fig. 3A, and the method includes:

s301, the powered device enters a first state.

Specifically, the first controller controls the powered device to enter a first state, where the first state represents a state of detecting a power level of the powered device, and in one possible implementation, the first state is a power level detection state, the first state corresponds to a time interval, and a reference time of the time interval may be a time when the powered device is electrically connected to the power supply device, and the time is a zero time.

In one possible embodiment, before the powered device enters the first state, the method further includes:

when the powered device detects that a first condition is met, the current state is determined to be a first state according to a detection result, the first condition is a condition for entering the first state, and the condition can be formed by combining one or more sub-connections by adopting different logical relations.

The first condition may specifically be any one of the following:

a. the voltage output by the power sourcing equipment to the powered device is greater than or equal to a first voltage threshold.

The first voltage threshold may be set as needed, where the first voltage threshold is a voltage threshold pre-stored or pre-configured by the powered device. For example, referring to fig. 3A, the first voltage threshold is 15V, the voltage from the power supplying apparatus to the powered apparatus is output to the powered apparatus through the network cable, and the control unit K2 of the powered apparatus detects that the voltage between the second positive-polarity pin D2+ and the second negative-polarity pin D2-is 16V, and determines that the current state of the powered apparatus is the first state.

b. The duration that the voltage output by the power supply device to the powered device is greater than or equal to the second voltage threshold is greater than or equal to the first duration.

The second voltage threshold is a voltage threshold pre-stored or pre-configured by the powered device, and the second voltage threshold can be set as required; the first time duration is a time duration threshold pre-stored or pre-configured by the powered device, and the first time duration may be set as needed. For example, referring to fig. 3A, when the second voltage threshold is 20V, the first duration is 1ms, and the control unit K2 of the powered device detects that the voltage between the second positive polarity pin D2+ and the second negative polarity pin D2 "is 25V for 1.5ms, it is determined that the powered device enters the first state.

c. The voltage output by the power supply apparatus to the power receiving apparatus is within a first voltage range.

The first voltage range may be a voltage interval pre-stored or pre-configured by the powered device, and the first voltage range may be formed by floating up and down with reference to the reference voltage. For example: referring to fig. 3A, the reference voltage is 15V, and the voltage is floated up and down by 10% based on 15V to form a first voltage range, and the control unit K2 of the powered device detects that the voltage between the second positive-polarity pin D2+ and the second negative-polarity pin D2-is 15.1V, and the voltage is in the first voltage range, and determines that the powered device enters the first state.

d. The duration of the voltage output by the power supply apparatus to the powered apparatus in the second voltage range is greater than or equal to the second time period.

The second voltage range may be a voltage interval pre-stored or pre-configured by the powered device, and the second voltage range may be formed by floating the reference voltage up and down. The second time period is a pre-stored or pre-configured time period of the powered device. For example: referring to fig. 3A, the second voltage range is formed by 20% fluctuation of 20V, i.e., the second voltage range is [16V,24V ], the second time duration is 2ms, the control unit K2 of the powered device detects that the time duration of 19V between the second positive-polarity pin D2+ and the second negative-polarity pin D2-is 3ms, and determines that the powered device enters the first state.

e. The current output by the power sourcing equipment to the powered device is greater than or equal to a first current threshold.

The first current threshold may be a current threshold pre-stored or pre-configured by the powered device, and the first current threshold may be set as required, for example: referring to fig. 3A, the first current threshold is 5mA, and the control unit K2 of the power sourcing equipment detects that the current between the second positive polarity pin D2+ and the second negative polarity pin D2-is 6mA, and determines that the powered device enters the first state.

f. The duration that the current output by the power supply device to the powered device is greater than or equal to the second current threshold is greater than or equal to the third duration.

The second current threshold is a current threshold pre-stored or pre-configured by the powered device, the second current threshold may be set as needed, the third time duration is a time duration threshold pre-stored or pre-configured by the powered device, and the third time duration may be set as needed. For example, referring to fig. 3A, when the second current threshold is 15mA and the third time period is 2ms, the control unit K2 of the powered device detects the duration 5ms that the current between the second positive polarity pin D2+ and the second negative polarity pin D2 "is 20mA, and determines that the powered device enters the first state.

g. The current output by the power supply apparatus to the power receiving apparatus is within a first current range.

The first current range may be a current interval pre-stored or pre-configured by the powered device, and the first current range may be formed by floating up and down with reference to the reference current. For example: referring to fig. 3A, the reference current is 20mA, and the first current range is formed by floating up and down by 10% based on 20mA, that is, the first current range is [18mA,22mA ], and the control unit K2 of the powered device detects that the current between the second positive-polarity pin D2+ and the second negative-polarity pin D2-is 19mA, and the current is in the first current range, and determines that the powered device enters the first state.

h. The duration of the current output by the power supply apparatus to the powered apparatus in the second current range is greater than or equal to the fourth time period.

The second current range may be a current interval pre-stored or pre-configured by the powered device, and the second current range may be formed by floating up and down with reference to the reference current. The fourth time period is a pre-stored or pre-configured time period of the powered device. For example: referring to fig. 3A, the second current range is formed by 20% fluctuation of the reference voltage of 20mA, that is, the second voltage range is [16mA,24mA ], the fourth time duration is 3ms, the control unit K2 of the powered device detects that the time duration of the voltage between the second positive-polarity pin D2+ and the second negative-polarity pin D2-is 19mA is 4ms, and it is determined that the powered device enters the first state.

i. The duration that the powered device is in the first state is greater than or equal to a fifth duration.

The fifth time period is a time period pre-stored or pre-configured by the powered device, and the reference time point of the powered device may be a time when the powered device is electrically connected with the power supply device, and the time is set to be zero.

k. The power receiving equipment receives an indication signal sent by the power supply equipment, wherein the indication signal is used for indicating the power receiving equipment to enter a first state.

The indication signal is a signal with specific signal characteristics, the signal characteristics comprise one or more of amplitude, phase and period, and the indication signal can be a square wave, a sine wave or a triangular wave. For example: the indication signal is a square wave signal with an amplitude of 5V and a period of 1S, or the powered device receives an indication signal sent by another device, and is not limited to receiving the indication signal from the power supply device, and the invention is not limited.

S302, the powered device controls at least one of the one or more first loads in the powered device to be in a conducting state and the second load in the powered device to be in a disconnected state.

Specifically, the first load and the second load are loads consuming electric energy in the circuit, and the first load and the second load may be one or more of an inductive load, a capacitive load and a resistive load. The first load is used for detecting the power level of the powered device, and the second load is a work load of the powered device. In one possible embodiment, the first load is a characteristic resistance. As described in the embodiments of the present invention, the on state represents a state in which the load is connected to the circuit to consume the power of the power supply device, and the off state represents a state in which the load is not connected to the circuit to consume the power of the power supply device; for example: referring to fig. 3A, the powered device includes a first load Rs1 and a second load Rload, and when the control unit K2 detects that the powered device enters the first state, it indicates that the first controlled switch S1 is in the closed state, the first load Rs1 is in the conductive state, and indicates that the second controlled switch S2 is in the open state, and the second load Rload is in the open state. When at least one load is in a conducting state, the voltage output by the power supply equipment can be recorded on the at least one load to form current, and the power supply equipment can determine the power grade of the powered equipment by detecting the current, so that the power grade of the powered equipment is detected in a hardware mode, the power grade of the powered equipment is not required to be known in a message interaction mode, the time consumed by modulation and demodulation in a message transmission process is avoided, and the time for determining the power grade of the powered equipment is greatly reduced.

In this embodiment, the at least one of the one or more first loads is in a conducting state, which means that the number of the first loads in the conducting state in the powered device is less than or equal to the total number of the first loads, and the connection relationship between the one or more first loads is not limited in this embodiment, and may be series, parallel, or series-parallel. For example: referring to fig. 3C, the powered device includes 2 first loads Rs1 and Rs2 connected in parallel, and when the powered device enters the first state, the first load Rs1 is controlled to be in the on state, the first load Rs2 is controlled to be in the off state, and the second load Rload is controlled to be in the off state. Another example is: when the powered device enters the first state, the first load Rs1 is controlled to be in the on state, the first load Rs2 is controlled to be in the on state, and the second load Rload is controlled to be in the off state.

In one possible embodiment, the powered device may control the at least one first load to be in the on state or the off state a plurality of times during the first state. For example: the powered device includes a first load Rs1, a first load Rs2, a first load Rs3, and a first load Rs4, and during the first state, the powered device first controls the first load Rs1 to be in a conducting state, and the second load Rload to be in a disconnecting state; then the first load Rs2 is controlled to be in the on state, at this time, the first load Rs1 still keeps the on state, and the second load Rload still keeps the off state; finally, the first loads Rs3 and Rs4 are controlled to be in the on state, the first load Rs1 is controlled to be in the off state, the first load Rs2 still keeps in the on state, and the second load Rload still keeps in the off state. The order and the number of the first load controlled by the powered device to be in the on state or the off state for multiple times may be set as required, and the above description is only an example and is not a limitation to the embodiment of the present invention. The number of power levels of the powered device can be increased by controlling the first load to be in the on state for multiple times, and the purpose of outputting a voltage with finer granularity is achieved.

In a possible embodiment, the second load is in the off-state for the entire time the at least one first load is in the on-state, which entire time represents the time interval during which the first load is in the on-state. For example: the time interval of the at least one first load in the on state is [ t0, t0+5ms ], and the second load is also in the off state in the time interval [ t0, t0+5ms ].

In another possible implementation manner, the at least one first load is in the on state for a part of the time, the second load is in the off state, the total time of the first at least one first load being in the on state is a time interval, the partial time is a continuous time interval in the total time, and the length and the position of the partial time may be set according to needs, and embodiments of the present invention are not limited. For example: the time interval of the at least one first load in the on state is [ t0, t0+5ms ], the second load is in the on state in the time interval [ t0, t0+0.5ms ], and the second load is also in the off state in the time interval (t0+0.5ms, t0+5ms ].

The power supply device is pre-stored or pre-configured as a mapping relationship between a current range and a power level, and the mapping relationship is shown in table 1:

TABLE 1

Taking the power supply device in fig. 3A as an example, assuming that the power supply device detects that the current between the first positive pin D1+ and the first negative pin D1-of the first ethernet interface E1 is 10mA, the current falls into a voltage range of 8-13mA, the voltage range corresponds to a power class of 1, and the output power wie4.0W corresponds to the power class, the control unit K1 of the power supply device instructs the dc voltage source Vpse to adjust the output voltage, so that the power supply device provides the required voltage or current of 4.0W to the powered device through the D1+ pin and the D1-pin of the first ethernet interface E1.

In one possible embodiment, the method further comprises: the powered device enters a second state, during which the second load is in a conducting state, where the second state may be a normal power supply state or a detection state, and a duration of the second state may be set as required, which is not limited in the embodiments of the present invention. For example: as described with reference to fig. 3A, when the second controller determines that the powered device enters the second state, during the second state, the control unit K2 indicates that the second controlled switch is in the closed state, thereby controlling the second load Rload to be in the conductive state.

Further, the powered device enters a second state during which the powered device controls the second load to be in the on-state and controls the one or more first loads to be in the off-state. The one or more first loads are all first loads in the powered device, for example: referring to fig. 3A, when the second controller determines that the powered device enters the second state, it indicates that the first controlled switch S1 is in an open state and indicates that the second controlled switch is in a closed state.

Further, the second condition includes at least one of:

A. the voltage output by the power sourcing equipment to the powered device is greater than or equal to a third voltage threshold.

The third voltage threshold is different from the first voltage threshold, where the third voltage threshold is a voltage threshold pre-stored or pre-configured by the powered device, and the third voltage threshold may be set as needed. For example, referring to fig. 3A, the third voltage threshold is 40V, the voltage from the power supplying apparatus to the powered apparatus is output to the powered apparatus through the network cable, and the control unit K2 of the powered apparatus detects that the voltage between the second positive-polarity pin D2+ and the second negative-polarity pin D2-is 50V, and determines that the current state of the powered apparatus is the second state.

B. The duration that the voltage output by the power supply equipment to the powered equipment is greater than or equal to the fourth voltage threshold is greater than or equal to a sixth time length.

The fourth voltage threshold is different from the second voltage threshold, the fourth voltage threshold is a voltage threshold pre-stored or pre-configured by the powered device, and the fourth voltage threshold can be set as required; the sixth time duration is a time duration threshold pre-stored or pre-configured by the powered device, and the sixth time duration may be set as needed. For example, referring to fig. 3A, when the fourth voltage threshold is 5V and the sixth time period is 1ms, the control unit K2 of the powered device detects that the voltage between the second positive polarity pin D2+ and the second negative polarity pin D2 "is 6V for 1.5ms, and determines that the powered device enters the second state.

C. The voltage output by the power supply apparatus to the power receiving apparatus is within a third voltage range.

The third voltage range is different from the first voltage range, and the third voltage range is not overlapped with the first voltage range, the third voltage range is a voltage interval, the third voltage range may be a voltage interval pre-stored or pre-configured by the powered device, and the third voltage range may be formed by floating up and down with reference to the reference voltage. For example: referring to fig. 3A, the reference voltage is 5V, and the voltage is floated up and down by 10% on the basis of 5V to form a third voltage range, and the control unit K2 of the powered device detects that the voltage between the second positive polarity pin D2+ and the second negative polarity pin D2-is 5.1V, and the voltage is in the third voltage range, and determines that the powered device enters the second state.

D. A duration of the voltage output by the power supply apparatus to the power receiving apparatus within the fourth voltage range is greater than or equal to a seventh duration.

The fourth voltage range is different from the second voltage range, and the fourth voltage range is not overlapped with the second voltage range, the fourth voltage range is a voltage interval, the fourth voltage range may be a voltage interval pre-stored or pre-configured by the powered device, and the fourth voltage range may be formed by floating the reference voltage up and down. The seventh time period is a pre-stored or pre-configured time period of the powered device. For example: referring to fig. 3A, the fourth voltage range is formed by the fluctuation of 20% above and below the reference voltage of 10V, i.e. the second voltage range is [8V,12V ], the second time duration is 2ms, the control unit K2 of the powered device detects that the time duration of the voltage between the second positive-polarity pin D2+ and the second negative-polarity pin D2-is 11V is 3ms, and determines that the powered device enters the second state.

E. The current output by the power sourcing equipment to the powered device is greater than or equal to a third current threshold.

The third current threshold is different from the first current threshold, and may be a current threshold pre-stored or pre-configured for the powered device, and the third current threshold may be set as needed, for example: referring to fig. 3A, the first current threshold is 10mA, and the control unit K2 of the power sourcing equipment detects that the current between the second positive polarity pin D2+ and the second negative polarity pin D2-is 12mA, and determines that the powered device enters the second state.

F. The duration that the current output by the power supply device to the powered device is greater than or equal to the fourth current threshold is greater than or equal to an eighth time period.

The fourth current threshold is different from the second circuit threshold, the fourth current threshold is a current threshold pre-stored or pre-configured by the powered device, the fourth current threshold can be set as required, the eighth time duration is a time duration threshold pre-stored or pre-configured by the powered device, and the eighth time duration can be set as required. For example, referring to fig. 3A, when the fourth current threshold is 50mA and the third time period is 2ms, the control unit K2 of the powered device detects the current between the second positive polarity pin D2+ and the second negative polarity pin D2 "as 5ms, and determines that the powered device enters the second state.

The current output by the G power sourcing equipment to the powered device is in a third current range.

The third current range is different from the first current range, and the third current range is not overlapped with the first current range, the third current range is a current interval, the third current range may be a current interval pre-stored or pre-configured by the powered device, and the third current range may be formed by up-and-down floating of the reference current as a reference. For example: referring to fig. 3A, the reference current is 2mA, and the first current range is formed by floating up and down by 10% based on 2mA, that is, the third current range is [1.8mA,2.2mA ], and the control unit K2 of the powered device detects that the current between the second positive-polarity pin D2+ and the second negative-polarity pin D2-is 1.9mA, and the current is in the third current range, which determines that the powered device enters the second state.

H. The duration of the current output by the power supply apparatus to the power receiving apparatus in the fourth current range is greater than or equal to a ninth duration.

The fourth current range is different from the second current range, and the fourth current range is not overlapped with the second current range, the fourth current range is a current interval, the fourth current range may be a current interval pre-stored or pre-configured by the powered device, and the fourth current range may be formed by up-and-down floating of the reference current as a reference. The ninth time period is a time length pre-stored or pre-configured by the powered device. For example: referring to fig. 3A, the fourth current range is formed by the fluctuation of 20% from 2mA as the reference voltage, that is, the second voltage range is [1.6mA,2.4mA ], the ninth time period is 3ms, and the time period when the control unit K2 of the powered device detects that the voltage between the second positive polarity pin D2+ and the second negative polarity pin D2-is 1.9mA is 4ms, determines that the powered device enters the second state.

I. A duration that the powered device is in the second state is greater than or equal to a tenth duration.

The tenth time period is a time period pre-stored or pre-configured by the powered device, and the reference time point of the powered device may be a time when the powered device is electrically connected with the power supply device, and the time is set to be zero.

J. And receiving an indication signal sent by a power supply device, wherein the indication signal is used for indicating the power receiving device to enter the second state. Or the power receiving apparatus receives the indication signal transmitted by the other apparatus, and is not limited to receiving the indication signal from the power supply apparatus, and the present invention is not limited thereto.

Wherein the indication signal is a signal of a particular signal characteristic, the signal characteristic comprising one or more of amplitude, phase, period, for example: the indication signal is a square wave signal with the amplitude of 5V and the period of 1S.

In another possible embodiment, the second condition includes at least one of:

the voltage output by the power supply equipment to the powered equipment is less than a first voltage threshold;

the voltage output by the power supply apparatus to the power receiving apparatus does not satisfy: the duration time greater than or equal to the second voltage threshold is greater than or equal to the first duration time;

a voltage output from a power supply apparatus to the power receiving apparatus is not within a first voltage range;

the voltage output by the power supply apparatus to the power receiving apparatus does not satisfy: the duration in the second voltage range is greater than or equal to a second duration;

the current output by the power supply equipment to the powered equipment is less than a first current threshold;

the current output by the power supply apparatus to the power receiving apparatus does not satisfy: the duration of time greater than or equal to the second current threshold is greater than or equal to a third duration;

the current output by the power supply apparatus to the power receiving apparatus is not in a first current range;

the current output by the power supply apparatus to the power receiving apparatus does not satisfy: a duration in the second current range is greater than or equal to a fourth duration;

the duration that the powered device is in the first state is less than a fifth duration.

In this embodiment, the second condition is negation of the first condition, and the specific implementation process may refer to the description in the first condition, which is not described herein again.

In a possible embodiment, the controlled switches in the second controller are transistors, and when the number of the controlled switches in the second controller is multiple, the types of the multiple controlled switches may be the same or different. Referring to fig. 4, the second controller includes a first controlled switch S1, a second controlled switch S2, and a control unit K2, and the first controlled switch S1 and the second controlled switch S2 are both transistors, and the on and off states of the first load Rs1 and the second load Rload are controlled by using the on and off functions of the transistor.

In a possible embodiment, the controlled switches in the second controller are metal-oxide-semiconductor field-effect transistors (MOSFETs), and when the number of the controlled switches in the second controller is multiple, the types of the multiple controlled switches may be the same or different. Referring to fig. 5, the second controller includes a first controlled switch S1, a second controlled switch S2, and a control unit K2, and the first controlled switch S1 and the second controlled switch S2 are MOSFETs, and control on and off states of the first load Rs1 and the second load Rload using a transistor on and off function.

As can be seen from the above description, the embodiments of the present invention detect the power level of the powered device in a hardware manner, and compared with a manner of detecting the power level using a request message and a response message, the embodiments do not need modulation and demodulation of the message and a transmission process of the message, thereby greatly reducing the time for detecting the power level of the powered device.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A control method is applied to a powered device, wherein the powered device belongs to a pair of wire power over Ethernet systems; the method comprises the following steps:

the powered device enters a first state; the first state is a power level detection state;

the powered device controlling at least one of one or more first loads in the powered device to be in an on state and a second load in the powered device to be in an off state, the one or more first loads being classified loads; the current when the at least one first load is in a conducting state is used to determine a power level of the powered device.

2. The method of claim 1,

at any time during the powered device being in the first state, the number of first loads in the on state is less than the number of the one or more first loads.

3. The method of claim 1, wherein before the powered device enters the first state, the method further comprises:

and the powered device detects that a first condition is met, and determines that the current state is the first state according to the detection result.

4. The method of claim 2, wherein before the powered device enters the first state, the method further comprises:

5. The method of claim 3, wherein the first condition comprises at least one of:

the duration of the voltage output to the powered device by the power supply device is greater than or equal to a second voltage threshold and is greater than or equal to a first duration;

a voltage output from a power supply apparatus to the power receiving apparatus is within a first voltage range;

the duration of the voltage output by the power supply equipment to the powered equipment in the second voltage range is greater than or equal to a second time length;

the duration of the current output by the power supply equipment to the powered equipment, which is greater than or equal to the second current threshold, is greater than or equal to a third time length;

receiving an indication signal sent by a power supply device, wherein the indication signal is used for indicating the powered device to enter the first state.

6. The method of claim 4, wherein the first condition comprises at least one of:

7. The method according to any one of claims 1-6, further comprising:

8. The method of claim 7, further comprising:

9. The method of claim 7, wherein before the powered device enters the second state, the method further comprises:

and the powered device detects that a second condition is met, and determines that the current state is the second state according to the detection result.

10. The method of claim 9, wherein the second condition comprises at least one of:

the duration that the voltage output by the power supply equipment to the powered equipment is greater than or equal to a fourth voltage threshold is greater than or equal to a sixth time length;

a voltage output by the power supply apparatus to the power receiving apparatus is within a third voltage range;

the duration of the voltage output by the power supply apparatus to the powered apparatus in the fourth voltage range is greater than or equal to a seventh duration;

the duration that the current output by the power supply equipment to the powered equipment is greater than or equal to a fourth current threshold is greater than or equal to an eighth time length;

and receiving an indication signal sent by a power supply device, wherein the indication signal is used for indicating the power receiving device to enter the second state.

11. A powered device is characterized by belonging to a pair of line Ethernet power supply systems; the power receiving apparatus includes: a controller, one or more first loads, and a second load,

a controller for controlling the powered device to enter a first state; the first state is a power level detection state;

the controller is further configured to control at least one of one or more first loads in the powered device to be in a conducting state and a second load in the powered device to be in a disconnecting state, the one or more first loads being classified loads; the current when the at least one first load is in a conducting state is used to determine a power level of the powered device.

12. The power receiving apparatus according to claim 11,

13. The powered device of claim 11, wherein the controller is further configured to:

14. The powered device of claim 12, wherein the controller is further configured to:

15. The power receiving apparatus according to claim 13, wherein the first condition includes at least one of:

16. The power receiving apparatus according to claim 14, wherein the first condition includes at least one of:

17. The powered device according to any one of claims 11 to 16, wherein the controller is further configured to:

controlling the powered device to enter a second state; wherein during the second state, the second load is in a conducting state.

18. The powered device of claim 17, wherein the controller is further configured to:

controlling one or more first loads in the powered device to be in a disconnected state.

19. The powered device of claim 18, wherein the controller is further configured to:

and detecting that a second condition is met, and determining that the current state is the second state according to the detection result.

20. The power receiving apparatus according to claim 19, wherein the second condition includes at least one of:

21. A power over ethernet system comprising a power sourcing equipment and a powered device according to any one of claims 11 to 20.